ORINDA — Power to customers affected by an outage created when a tree toppled over late Sunday night is expected to be restored by early this afternoon, a PG&E spokesman said.

All but 37 customers were up and running by 9 a.m. Monday morning after overnight repairs required when the tree knocked over a power pole on Moraga Way near Altamount and Ivy drives, spokesman John King said. The tree toppled at about 10 p.m. Sunday night.

It is unknown why the tree fell over, though saturated ground from Sunday night’s rain and recent storms likely was a factor, King said. Nobody was injured.

Initially, 3,000 customers were without power. All but 149 of them had power restored by midnight, King said. PG&E crews switched power to an alternate route while making repairs, he said.

Motorists were advised to avoid the area, and Moraga Way was expected to experience delays until 1 p.m. on Monday, police said. Traffic going north on Moraga Way can use Ivy Drive as a detour.

Rick Hurd covers breaking news. Contact him in Walnut Creek at 925-945-4780 and follow him at Twitter.com/3rdERH.